Workers at the Shannon Aerospace aircraft maintenance facility have voted for industrial action in a dispute over pension contributions.
Members of SIPTU have voted for a four-hour work stoppage on 4 March and will refuse to work overtime in the meantime.
The company had previously informed the 500 employees that it intends to cease contributions to its Defined Benefit Pension scheme.
The move is despite the fact that the scheme is not in deficit and the company is profitable.
Workers have opposed the move, arguing that there is no need for management to close the Defined Benefit Scheme and replace it with a Defined Contribution Scheme, which carries greater risk for employees.
Shannon Aerospace is owned by the German Lufthansa group, which recently closed another Irish-based facility, Lufthansa Technik Airmotive in Rathcoole, Co Dublin, with the loss of over 400 jobs.
In a previous statement, the company said the outcome of the ballot would have implications for the company.
It expressed hope that "any proposed industrial action could be avoided for the benefit of all stakeholders".